ELECTRIC CIRCUITSEIGHTH EDITION
JAMES W. NILSSON
&
SUSAN A. RIEDEL
CHAPTER 1
CIRCUIT VARIABLES
¨Ï 2008 Pearson Education
CONTENTS
1.1 Electrical Engineering: An Overview
1.2 The International System of Units
1.3 Circuit Analysis: An Overview
¨Ï 2008 Pearson Education
CONTENTS
1.4 Voltage and Current
1.5 The Ideal Basic Circuit Element
1.6 Power and Energy
¨Ï 2008 Pearson Education
1.1 Electrical Engineering
Electrical engineering is the profession concerne...
ELECTRIC CIRCUITSEIGHTH EDITION
JAMES W. NILSSON
&
SUSAN A. RIEDEL
CHAPTER 1
CIRCUIT VARIABLES
¨Ï 2008 Pearson Education
CONTENTS
1.1 Electrical Engineering: An Overview
1.2 The International System of Units
1.3 Circuit Analysis: An Overview
¨Ï 2008 Pearson Education
CONTENTS
1.4 Voltage and Current
1.5 The Ideal Basic Circuit Element
1.6 Power and Energy
¨Ï 2008 Pearson Education
1.1 Electrical Engineering
Electrical engineering is the profession concerned with systems that produce, transmit, and measure electric signals.
Communication systems
Computer systems
Control systems
Power systems
Signalprocessing systems
¨Ï 2008 Pearson Education
1.1 Electrical Engineering
¨Ï 2008 Pearson Education
A telephone system
1.1 Electrical Engineering
Computerized tomography (CT) scan of an adult head
¨Ï 2008 Pearson Education
Circuit Theory
A special case of electromagnetic field theory: the study of static and moving electric charges.
¨Ï 2008 P¡¦(»ý·«)
earson Education
1.1 Electrical Engineering
Circuit Theory
Three basic assumptions:
Electrical effects happen instantaneously throughout a system.
The net charge on every component in the system is always zero.
There is no magnetic coupling between the components in a system.
¨Ï 2008 Pearson Education
1.2 The International System of Units
The International System of Units (SI) enables engineers to communicate in a meaningful way about quantitative results.
¨Ï 2008 Pearson Education
The SI units are based on seven defined quantities:
cd
candela
Luminous intensity
mol
mole
Amount of substance
K
degree kelvin
Thermodynamic temperature
A
ampere
Electric current
s
second
Time
kg
kilogram
Mass
m
meter
Length
Symbol
Basic Unit
Quantity
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Derived units in SI
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1.2 The International System of Units
Standardized Prefixes
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Standardized prefixes to signify power of 10
